Well, your faith was strong, but you needed proof.

❝But I tell you, do not swear
an oath at all:
either by Heaven, for it is God’s throne;
or by the earth,
for it is His footstool;
or by Jerusalem, for it is the
city of the Great King.
And do not swear by your head,
for you cannot make even
one hair white
or black.
All you need to say is simply 'Yes' or 'No';
anything beyond this comes from
the evil one.
—Matthew 5:34-37